docs: Update README.md with improved formatting and new challenge

[imwaymaran]

📝 Description of the Issue or Request

Provide a clear and concise description of the issue or request.
Is this for updating an existing document or creating a new one?

• Update existing document
• Create a new document

---

🔍 Details

• Document Name/Section: README.md
• Specific Location/Line: About, Solutions, Collaborations sections

---

⚠️ Problem, Request, or Improvement

If updating an existing document:

• Problem: The README.md file needs improved formatting for clarity and consistency.
• Improvement: Update the formatting of the About, Solutions, and Collaborations sections. Also add a new challenge description to the Solutions section.